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We've done that!
In the best of circumstances a four color press is best even if its a portrait Ryobi 3304 type press for running CMYK--metal or poly.
Next a two tower two color press (2 separate blankets) like the GTO type landscape (14x20) press or a portrait Ryobi 3302 type press (13x17.24) work best. These presses have good register systems for second pass register using metal plates and will give you very good results for most jobs with a lot of practice. I don't remember what sequence we used to use and I thank God we don't have to because we have a five color GTO.
Now the Heidelberg Quickmaster is a great press for what it was designed to do and CMYK printing is not one of them; this press is the Mercedes Benz of the duplicator type presses--a two head common blanket reminiscent of ABDick 360 with a T-head type press.
A good pressman will give you pleasing color from the Quickmaster resulting in a dull slightly fuzzy look. This is because two colors are inking to the same blanket at the same time before transferring to the sheet and a greater amount of plugging up of the inks is occurring. In a two tower or multi tower press, each tower has its own blanket and each ink is transfered direct to the sheet one at a time resulting in a crisper cleaner image with much less plugging up of the inks.
Hope this helps. 8)
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JaimeZ
just an ol\' printer...
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